Kingdom of Strathclyde

The Kingdom of Strathclyde, also known as Strat Clut or Alt Clut, was a Brythonic kingdom in southern Scotland and northern England which existed from the 5th century AD to 1030, with Dumbarton (Alt Clut) serving as its capital. It was part of the "Old North", an ethnically-Welsh region of northern Britannia, and Strathclyde became a prime target for seafaring Viking raiders during the Viking invasions of England in the late 9th century. In 870, the Vikings of Sudreyjar captured Dumbarton Rock, sacking the city and damaging Strathclyde's power. However, it survived until 1030, when it was incorporated into the Kingdom of Scotland.